[APD] RUGF versus UGF

["Tom Wood" <tomwood2 at flash_net>]

T. Barr said: "I've had RFUG's for 10 years with plants."

Why a RUGF versus a UGF?

Just curious since I recently installed a version of a UGF in my 
90 - Perforated PVC pipes under a sheet of plastic insect screen 
under the substrate, piped back to a submersible pump that is 
pulling the water down through the substrate. I could reverse 
that flow to push water up through the substrate, but why?

TW 


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